LinearAlgebra/addmul/mul!(::Matrix{Float64}, ::Matrix{Int64}, ::LinearAlgebra.SymTridiagonal{Float64, V} where V<:AbstractVector{Float64}, α, β)/α = true, β = 0.0/β = 0 ignores C .= NaN @test ≈(collect(returned_mat), exp_val, rtol = rtol, atol = atol)